Summer 2025 Start. The deadline for early decision is december 13. Please check novaconnect for start dates and census dates for variable duration (dynamic) sessions.

Summer 2025 starts on friday, june 20th in the northern hemisphere, with the first day of summer being the longest daylight day of the year with the earth’s axis having reached its furthest tilt and begins to change directiion back. Summer starts at the moment when the sun is farthest north: